Zirconia is a very hard and durable material, with low thermal conductivity, high strength and flexibility. Because of certain additives, the material has a high resistance to corrosion and a melting point higher than Alumina. Zirconia (ZrO2) products can withstand the high temperature up to 2100°C. It is an ideal material for the melting of precious metals and super-alloys which have melting point higher than 1800°C.

Furthermore, additions of some oxides (MgO, CaO,Y2O3) to pure zirconiadepress allotropic transformations (crystal structure changes) and allow to stabilize either cubic or tetragonal structure of the material at any temperature.

Application of Zirconia Ceramics
1.Wire forming/drawing dies
2.Insulating rings in thermal processes
3.Precision shafts and axles in high wear environments
4.Furnace process tubes
5.Wear resistance pads
6.Thermocouple protection tubes
7.Sandblasting nozzles
8.Refractory material
9.Extrusion dies
10.Bushings and caps
11.Kiln furniture crucible
12.Fiber optic ferrules and sleeves
13.Knives and blades
14.Fuel cell parts
15.Bearings & rollers
16.Welding nozzles & pins
17.Laser parts
18.Gas igniters
19.Electric insulator
20.Ceramic guiders
21.Oxygen sensors
22.Medical and surgical component
23.Mechanical seals
24.Pumps, pistons, and liners

Characteristics	Unit	95Al2O3	99Al2O3	ZrO2	GPSi3N4	BN	GlassCeramic
CrystalStructure	-	hexagonal	hexagonal	tetragonal	hexagonal	hexagonal	-
Color	-	white	ivory	white	gray	white	white
Density	g/cm3	3.65	3.88	5.95	3.22	2.26	2.55
WaterAbsorption	%	0	0	0	0	0.0-1.0	0
Young'sModulus	Gpa	280	350	205	295	670	65
VickersHardness	Gpa	14	20	12	18-20	-	-
FlexuralStrength	Mpa	280	300	900	650	51	100
CompressiveStrength	Mpa	2000	2500	2200	2200	230	500
ThermalConductivity	W/(m·k)	18-25	30	2.2	25	20	1.7
Thermalshockresistance	Δ(℃)	220	180-200	280-350	450-650	>1500	25-100
Max.WorkingTemperature	℃	1500	1700	850	1200	960	800
VolumeResistivity	Ω·cm	>10^15	>10^14	>10^12	>10^14	10^13	10^16
DielectricConstant(1MHz)	-	9.5	9.8	26	8.2	4.08	6.02
DielectricStrength	kV/mm	16	22	-	16	375	40

About Unipretec
UniPreTec, advanced ceramics expert, provides component and custom integrated packaging solutions for Aerospace, Medical, Power Generation & Distribution, Automotive, Process Control & Monitoring, Industrial Equipment, Electronic & Electrical. Our materials include Alumina, Zirconia, Zirconia Toughened Alumina, Silicon Carbide, Silicon Nitride and further special materials.Our technologies and equipments allow us to provide various and flexible forming processes, like dry pressing, isostatic pressing, extrusion, injection moulding and slip casting.